A data mapping (DM) computing device including a processor and a memory in communication with the processor is provided. The processor receives a plurality of validated data messages associated with a plurality of transactions through a first communication channel and receives a non-validated data message associated with a first transaction through a second communication channel. Each validated data message includes a plurality of validated data elements with a validated merchant identifier. The non-validated data message includes a plurality of non-validated data elements with a non-validated merchant identifier. The processor further compares the validated data messages and the non-validated data message, identifies a validated data message that is associated with the first transaction based on the comparison, maps the non-validated merchant identifier and the validated merchant identifier of the identified validated message, and stores the mapped merchant identifiers in a linked identifier table within the memory.
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